Go to src/map/atcommand.cpp
search for ACMD_FUNC(go)
And here are the coordinates of @go.
Like this.
/*==========================================
* @go [city_number or city_name] - Updated by Harbin
*------------------------------------------*/
ACMD_FUNC(go)
{
int i;
int town;
char map_name[MAP_NAME_LENGTH];
const struct {
char map[MAP_NAME_LENGTH];
int x, y;
} data[] = {
{ MAP_PRONTERA, 156, 191 }, // 0=Prontera
{ MAP_MORROC, 156, 93 }, // 1=Morroc
{ MAP_GEFFEN, 119, 59 }, // 2=Geffen
{ MAP_PAYON, 162, 233 }, // 3=Payon
{ MAP_ALBERTA, 192, 147 }, // 4=Alberta
#ifdef RENEWAL
{ MAP_IZLUDE, 128, 146 }, // 5=Izlude (Renewal)
#else
{ MAP_IZLUDE, 128, 114 }, // 5=Izlude
#endif
{ MAP_ALDEBARAN, 140, 131 }, // 6=Al de Baran
{ MAP_LUTIE, 147, 134 }, // 7=Lutie
{ MAP_COMODO, 209, 143 }, // 8=Comodo
{ MAP_YUNO, 157, 51 }, // 9=Yuno
{ MAP_AMATSU, 198, 84 }, // 10=Amatsu
{ MAP_GONRYUN, 160, 120 }, // 11=Gonryun
{ MAP_UMBALA, 89, 157 }, // 12=Umbala
{ MAP_NIFLHEIM, 21, 153 }, // 13=Niflheim
{ MAP_LOUYANG, 217, 40 }, // 14=Louyang
#ifdef RENEWAL
{ MAP_NOVICE, 18, 26 }, // 15=Training Grounds (Renewal)
#else
{ MAP_NOVICE, 53, 111 }, // 15=Training Grounds
#endif
{ MAP_JAIL, 23, 61 }, // 16=Prison
{ MAP_JAWAII, 249, 127 }, // 17=Jawaii
{ MAP_AYOTHAYA, 151, 117 }, // 18=Ayothaya
{ MAP_EINBROCH, 64, 200 }, // 19=Einbroch
{ MAP_LIGHTHALZEN, 158, 92 }, // 20=Lighthalzen
{ MAP_EINBECH, 70, 95 }, // 21=Einbech
{ MAP_HUGEL, 96, 145 }, // 22=Hugel
{ MAP_RACHEL, 130, 110 }, // 23=Rachel
{ MAP_VEINS, 216, 123 }, // 24=Veins
{ MAP_MOSCOVIA, 223, 184 }, // 25=Moscovia
{ MAP_MIDCAMP, 180, 240 }, // 26=Midgard Camp
{ MAP_MANUK, 282, 138 }, // 27=Manuk
{ MAP_SPLENDIDE, 201, 147 }, // 28=Splendide
{ MAP_BRASILIS, 182, 239 }, // 29=Brasilis
{ MAP_DICASTES, 198, 187 }, // 30=El Dicastes
{ MAP_MORA, 44, 151 }, // 31=Mora
{ MAP_DEWATA, 200, 180 }, // 32=Dewata
{ MAP_MALANGDO, 140, 114 }, // 33=Malangdo Island
{ MAP_MALAYA, 242, 211 }, // 34=Malaya Port
{ MAP_ECLAGE, 110, 39 }, // 35=Eclage
{ MAP_LASAGNA, 193, 182 }, // 36=Lasagna
};
If you change the coordinates recompile.